Gemstone Type : Natural Ruby Approx. Weight (ct) : 2.45 Ct. Shape: Oval Cabochan Size/Dimension (LxHxW) : 8.3 x 7 x 4.2 MM Color : Red Clarity : Transparent Luster : Good Origin : Africa Hardness : 9 Specific Gravity : 3.9 - 4.1 Refractive Index : 1.76 - 1.78 Chemical Composition : Al203